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AAT4250
Slew Rate Controlled Load SwitchSmartSwitchTM
PRODUCT DATASHEET
4250.2009.06.1.4 9
www.analogictech.com
Enable Function
The AAT4250 features an enable / disable function. This
pin (ON) is active high and is compatible with TTL or
CMOS logic. To assure the load switch will turn on, the
ON control level must be greater than 2.0V. The load
switch will go into shutdown mode when the voltage on
the ON pin falls below 0.8V. When the load switch is in
shutdown mode, the OUT pin is tri-stated, and quiescent
current drops to leakage levels below 1μA.
Reverse Output-to-Input Voltage
Conditions and Protection
Under normal operating conditions, a parasitic diode
exists between the output and input of the load switch.
The input voltage should always remain greater than the
output load voltage, maintaining a reverse bias on the
internal parasitic diode. Conditions where VOUT might
exceed VIN should be avoided since this would forward
bias the internal parasitic diode and allow excessive cur-
rent flow into the VOUT pin, possibly damaging the load
switch.
In applications where there is a possibility of VOUT
exceeding VIN for brief periods of time during normal
operation, the use of a larger value CIN capacitor is
highly recommended. A larger value of CIN with respect
to COUT will effect a slower CIN decay rate during shut-
down, thus preventing VOUT from exceeding VIN. In appli-
cations where there is a greater danger of VOUT exceeding
VIN for extended periods of time, it is recommended to
place a Schottky diode from VIN to VOUT (connecting the
cathode to VIN and anode to VOUT). The Schottky diode
forward voltage should be less than 0.45V.
Thermal Considerations and
High Output Current Applications
The AAT4250 is designed to deliver a continuous output
load current. The limiting characteristic for maximum
safe operating output load current is package power dis-
sipation. In order to obtain high operating currents,
careful device layout and circuit operating conditions
must be taken into account.
The following discussions will assume the load switch is
mounted on a printed circuit board utilizing the mini-
mum recommended footprint as stated in the Printed
Circuit Board Layout Recommendations section of this
datasheet.
At any given ambient temperature (TA), the maximum
package power dissipation can be determined by the fol-
lowing equation:
PD(MAX) = TJ(MAX) - TA
θJA
Constants for the AAT4250 are maximum junction tem-
perature (TJ(MAX) = 125°C) and package thermal resis-
tance (ΘJA = 150°C/W). Worst case conditions are calcu-
lated at the maximum operating temperature, TA =
85°C. Typical conditions are calculated under normal
ambient conditions where TA = 25°C. At TA = 85°C,
PD(MAX) = 267mW. At TA = 25°C, PD(MAX) = 667mW.
The maximum continuous output current for the AAT4250
is a function of the package power dissipation and the
RDS of the MOSFET at TJ(MAX). The maximum RDS of the
MOSFET at TJ(MAX) is calculated by increasing the maxi-
mum room temperature RDS by the RDS temperature
coefficient. The temperature coefficient (TC) is 2800ppm/
°C. Therefore, at 125°C:
RDS(MAX) = RDS(25°C) · (1 + TC · ΔT)
RDS(MAX) = 175mΩ · (1 + 0.002800 · (125°C - 25°C))
RDS(MAX) = 224mΩ
For maximum current, refer to the following equation:
IOUT(MAX) < PD(MAX)
RDS
1
2
⎛⎞
⎝⎠
For example, if VIN = 5V, RDS(MAX) = 224mΩ, and TA =
25°C, IOUT(MAX) = 1.7A. If the output load current were to
exceed 1.7A or if the ambient temperature were to
increase, the internal die temperature would increase
and the device would be damaged.
Higher peak currents can be obtained with the AAT4250.
To accomplish this, the device thermal resistance must
be reduced by increasing the heat sink area or by oper-
ating the load switch in a duty-cycle manner. Duty cycles
with peaks less than 2ms in duration can be considered
using the method below.